[Fix] pathlib issue windows with older onnxruntime versions

[felixdittrich92]

This PR:

• transform to string if pathlib Path object which raises issues on windows with older onnxruntime versions

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.22%. Comparing base (e08ff57) to head (b50d0e4).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   98.22%   98.22%           
=======================================
  Files          66       66           
  Lines        2030     2031    +1     
=======================================
+ Hits         1994     1995    +1     
  Misses         36       36           

Flag	Coverage Δ
unittests	98.22% <100.00%> (+<0.01%)	⬆️

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